What cultural and historical factors contributed to the global popularity of sushi?

Sushi, originally a Japanese delicacy, has become a global culinary sensation over recent decades. Its rise in popularity is not only due to its unique flavors and presentation but also a result of a confluence of cultural exchanges and historical developments. The American occupation of Japan post-World War II, the globalization of food media in the late 20th century, and a growing international interest in healthier eating habits have all played pivotal roles in promoting sushi worldwide. This question delves into the intricate tapestry of historical events, cultural exchanges, and modern trends that have propelled sushi from regional specialty to international icon.